Richard Gralnik on fri 30 jul 99
My next door neighbor has 4 small electric kilns and a lot of other supplies in
her garage from when she did glass slumping. One of the materials is
something she only knew of as "separator". Basically you dust the slumping
mold with this fine white powder before you lay the glass on it and heat to
slumping temperature. When the thing cools, the slumped glass lifts off of
the undamaged mold. Apparently the separator can be reused too.
Does anyone know what this probably very refractory stuff is or thoughts on
how to figure it out?
Thanks,
Richard
Jocelyn Olivia Mc Auley on sun 1 aug 99
On Fri, 30 Jul 1999, Richard Gralnik wrote:
> ----------------------------Original message----------------------------
> My next door neighbor has 4 small electric kilns and a lot of other supplies i
> her garage from when she did glass slumping. One of the materials is
> something she only knew of as "separator". Basically you dust the slumping
> mold with this fine white powder before you lay the glass on it and heat to
> slumping temperature. When the thing cools, the slumped glass lifts off of
> the undamaged mold. Apparently the separator can be reused too.
>
> Does anyone know what this probably very refractory stuff is or thoughts on
> how to figure it out?
>
Hello,
I attended a quick little workshop on glass slumping that simply used
kiln wash between the mold and the glass. The glass then easily released
from the mold when the firing was finished. Also, one can use bisque
fired ceramics for molds in this process.
Hope this helps,
Jocelyn McAuley
douglas adams on sun 1 aug 99
Odds are it's Alumina Hydrate. Hope she wore a dust mask.
>Does anyone know what this probably very refractory stuff is or thoughts on
>how to figure it out?
>
>Thanks,
>Richard
>
Priscilla Hollingsworth on mon 2 aug 99
A student of mine used kiln wash as a glass slumping separator - it
worked fine. The real product may contain plaster in addition to
alumnina and flint (I don't know if glass people use kaolin, as we do in
a standard kiln wash, but they might). Although it seems odd to
ceramics people to use plaster, it does not seem to cause blowup-type
problems when used as part of a separating agent.
A plate of glass will slump at a relatively low temperature. The
exact temperature depends on the glass. You might start with 017, 015 -
I've seen temperatures like that work for colored sheets of glass that
are normally used for stained glass.
Vivian Mills on tue 3 aug 99
Tis stuff is calcium carbonate, or whiting-- the same stuff that they used
to mix with oil and make putty to seal windows into frames.
I think you use it only once, and then discard it. Put it into the mold thru
a tea strainer, to distribute it more evenly.
You can even find directions in very old issues of Ceramics Monthly---
Vivian in Florida
-----Original Message-----
From: Richard Gralnik
To: CLAYART@LSV.UKY.EDU
Date: Friday, July 30, 1999 10:27 AM
Subject: Glass slumping separator
----------------------------Original message----------------------------
My next door neighbor has 4 small electric kilns and a lot of other supplies
in
her garage from when she did glass slumping. One of the materials is
something she only knew of as "separator". Basically you dust the slumping
mold with this fine white powder before you lay the glass on it and heat to
slumping temperature. When the thing cools, the slumped glass lifts off of
the undamaged mold. Apparently the separator can be reused too.
Does anyone know what this probably very refractory stuff is or thoughts on
how to figure it out?
Thanks,
Richard
Anji Henderson on tue 3 aug 99
FYI on Glass........
http://www.delphiglass.com/welcome.html
Lots of info and supplies. Free catalog, and info in the catalog (unless they
changed it)
Anji
Mike Bailey on tue 3 aug 99
In message , Richard Gralnik writes
Dear Richard,
Working out what unlabelled things are can be quite good fun, having a
kiln and doing bisque firing and stoneware is a great help as you can do
various tests.
A few hypothesis, trials you could do are:
Test for calcium carbonate (whiting) put 100 gms in a bowl and bisque
fire (around 1000 deg C.) weigh it afterwards. If it's lost somewhere
around 40 gms (the CO2) this indicates it's whiting.
If no LOI (Loss on ignition) one suspects alumina.
You could test for alumina by making a simple glaze and treating it as
the alumina in the recipe. If it behaves by producing a proper glaze
then this indicates it's alumina.
Do a button test. Alumina is extremely refractory and will stay as a
powder.
etc....
David Hewitt and I did an article on identifying unlabelled bags for
Ceramic Review a few years age, If interested I could Smail a photocopy.
Or knowing David, he might have it available, as on-line text.
Cheers,
Mike Bailey.
>----------------------------Original message----------------------------
>My next door neighbor has 4 small electric kilns and a lot of other supplies in
>her garage from when she did glass slumping. One of the materials is
>something she only knew of as "separator". Basically you dust the slumping
>mold with this fine white powder before you lay the glass on it and heat to
>slumping temperature. When the thing cools, the slumped glass lifts off of
>the undamaged mold. Apparently the separator can be reused too.
>
>Does anyone know what this probably very refractory stuff is or thoughts on
>how to figure it out?
>
>Thanks,
>Richard
>
--
Mike Bailey
Jim Brooks on wed 4 aug 99
Glass slumping requires a different kiln wash than we use.. The silica will
stick to the glass. So, try Alumina Ox and epk..50/50 mixture..Then you wont
have to worry about the glass sticking to the kiln wash......
Sharon R Pemberton on thu 5 aug 99
The 2 largest manufactuors of glass for fusing and Uroborus and Bullseye and,
I believe, Spectrum Glass is working in that direction. They both offer a
plethora of information on hot glass. All fusing glass can be used for
stained glass, MOST stained glass can only be fused to itself. Right now COE
90 is what most fusers are using. Bullseye also makes colored rods for
lampwork as does Moretti. Ed Hoy has good glass info also. These places all
have great web pages.
Pax tecum
eden@sover.net on sat 14 aug 99
I was just talking to a glass-slumping guy at the fair I'm doing and he
uses 80% alumina flour ( guess that's hydrate) and 20% kaolin.
Eleanora
...........
Eleanora Eden 802 869-2003
Paradise Hill
Bellows Falls, VT 05101 eden@sover.net
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